Grammar issue

git-svn-id: https://plugins.svn.wordpress.org/buddypress-bump-activity-streams-to-top/trunk@800717 b8457f37-d9ea-0310-8a92-e5e31aec5664
punctuation fix

git-svn-id: https://plugins.svn.wordpress.org/buddypress-bump-activity-streams-to-top/trunk@800718 b8457f37-d9ea-0310-8a92-e5e31aec5664